linux-kernel - Re: [PATCH v2 5/6] soc: qcom: rpmh powerdomain driver

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Date:   Wed, 30 May 2018 15:37:51 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     David Collins <collinsd@...eaurora.org>, sboyd@...nel.org,
        andy.gross@...aro.org, ulf.hansson@...aro.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lina Iyer <ilina@...eaurora.org>
Subject: Re: [PATCH v2 5/6] soc: qcom: rpmh powerdomain driver



On 05/30/2018 03:14 PM, Viresh Kumar wrote:
> On 30-05-18, 14:25, Rajendra Nayak wrote:
>> []...
>>
>>>>> +Required Properties:
>>>>> + - compatible: Should be one of the following
>>>>> +	* qcom,sdm845-rpmhpd: RPMh powerdomain for the sdm845 family of SoC
>>>>> + - power-domain-cells: number of cells in power domain specifier
>>>>> +	must be 1
>>>>> + - operating-points-v2: Phandle to the OPP table for the power-domain.
>>>>> +	Refer to Documentation/devicetree/bindings/power/power_domain.txt
>>>>> +	and Documentation/devicetree/bindings/opp/qcom-opp.txt for more details
>>>>> +
>>>>> +Example:
>>>>> +
>>>>> +	rpmhpd: power-controller {
>>>>> +		compatible = "qcom,sdm845-rpmhpd";
>>>>> +		#power-domain-cells = <1>;
>>>>> +		operating-points-v2 = <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>,
>>>>> +				      <&rpmhpd_opp_table>;
>>>>
>>>> Can this be changed to simply:
>>>>   operating-points-v2 = <&rpmhpd_opp_table>;
>>>>
>>>> The opp binding documentation [1] states that this should be ok:
>>>>
>>>>     If only one phandle is available, then the same OPP table will be used
>>>>     for all power domains provided by the power domain provider.
>>>
>>> thanks, I mentioned this to Viresh but didn't realize he fixed it up.
>>> Will remove the redundant entries.
>>
>> Looks like the kernel implementation does not handle this yet, and I get
>> an error adding the OPP tables for the powerdomains if I just specify
>> a single OPP table phandle.
>>
>> Viresh, is this expected with the latest patches in linux-next?
>>
>> It would be good if I can specify just one phandle instead of coping
>> the same phandle n times. 
> 
> Please try this untested hunk:

yes, seems to work.

> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index 6d15f05bfc28..7af0ddec936b 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -554,11 +554,24 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
>  int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
>  {
>         struct device_node *opp_np;
> -       int ret;
> +       int ret, count;
>  
> +again:
>         opp_np = _opp_of_get_opp_desc_node(dev->of_node, index);
> -       if (!opp_np)
> +       if (!opp_np) {
> +               /*
> +                * If only one phandle is present, then the same OPP table
> +                * applies for all index requests.
> +                */
> +               count = of_count_phandle_with_args(dev->of_node,
> +                                                  "operating-points-v2", NULL);
> +               if (count == 1 && index) {
> +                       index = 0;
> +                       goto again;
> +               }
> +
>                 return -ENODEV;
> +       }
>  
>         ret = _of_add_opp_table_v2(dev, opp_np);
>         of_node_put(opp_np);
> 
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